Bug #16000

This did not lead to any testing failures, but to a dependency problem. As the source code was processed correctly and the tests worked, I did not expect such a dependency problem. It was fixed manually bybu Takashi Kokubun (thanks!) as follows:

```
New Revision: 18603e9046

https://github.com/ruby/ruby/commit/18603e9046

Log:
Update dependencies for 369ff79394765ce198ac7cee872a8c739d895aaa

Just copy-pasting diff from
https://travis-ci.org/ruby/ruby/jobs/558407687

Modified files:
enc/depend.
```

I hope this can be fixed so that such errors can be avoided in the future.